Patents by Inventor Thomas V. Liston

Thomas V. Liston has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Dialkylamine complexes of borated alkyl catechols and lubricating oil compositions containing the same
    Patent number: 5284594
    Abstract: Borated alkyl catechols can be stabilized by the addition of certain defined dialkylamines.Lubricating oils containing a borated alkyl catecholdialkylamine complex are effective in reducing oxidation, wear and deposits in an internal combustion engine.
    Type: Grant
    Filed: February 24, 1992
    Date of Patent: February 8, 1994
    Assignee: Chevron Research and Technology Company
    Inventors: Vernon R. Small, Jr., Thomas V. Liston, Anatoli Onopchenko
  • Trialkylamine complexes of certain borated alkyl catechols and lubricating oil compositions containing the same
    Patent number: 5202039
    Abstract: Borated alkyl catechols having a 3:2 mole ratio of catechol to boron can be stabilized by the addition of certain defined trialkylamines. Lubricating oils containing a 3:2 borated alkyl catechol-trialkylamine complex are effective in reducing oxidation, wear and deposits in an internal combustion engine.
    Type: Grant
    Filed: February 24, 1992
    Date of Patent: April 13, 1993
    Assignee: Chevron Research and Technology Company
    Inventors: Vernon R. Small, Jr., Thomas V. Liston, Anatoli Onopchenko
  • Monoalkylamine complexes of borated higher carbon number alkyl catechols and lubricating oil compositions containing the same
    Patent number: 5160650
    Abstract: Borated alkyl catechols can be stabilized by the addition of certain defined monoalkylamines.Lubricating oils containing a borated alkyl catechol-monoalkylamine complex are effective in reducing oxidation, wear and deposits in an internal combustion engine.
    Type: Grant
    Filed: March 14, 1991
    Date of Patent: November 3, 1992
    Assignee: Chevron Research and Technology Company
    Inventors: Vernon R. Small, Jr., Thomas V. Liston, Anatoli Onopchenko
  • Dialkylamine complexes of borated higher carbon number alkyl catechols and lubricating oil compositions containing the same
    Patent number: 5160652
    Abstract: Lubricating oils containing a borated alkyl catechol-dialkylamine complex are effective in reducing oxidation, wear and deposits in an internal combustion engine.
    Type: Grant
    Filed: March 14, 1991
    Date of Patent: November 3, 1992
    Assignee: Chevron Research and Technology Company
    Inventors: Vernon R. Small, Jr., Thomas V. Liston, Anatoli Onopchenko
  • Trialkylamine complexes of borated higher carbon number alkyl catechols and lubricating oil compositions containing the same
    Patent number: 5160651
    Abstract: Borated alkyl catechols having a 3:2 mole ratio of alkyl catechol to boron can be stabilized by the addition of certain defined trialkylamines.Lubricating oils containing a 3:2 borated alkyl catechol-trialkylamine complex are effective in reducing oxidation, wear and deposits in an internal combustion engine.
    Type: Grant
    Filed: March 14, 1991
    Date of Patent: November 3, 1992
    Assignee: Chevron Research and Technology Company
    Inventors: Vernon R. Small, Jr., Thomas V. Liston, Anatoli Onopchenko
  • Monoalkylamine complexes of borated alkyl catechols and lubricating oil compositions containing the same
    Patent number: 5141660
    Abstract: Borated alkyl catechols can be stabilized by the addition of certain defined monoalkylamines.Lubricating oils containing a borated alkyl catecholmonoalkylamine complex are effective in reducing oxidation, wear and deposits in an internal combustion engine.
    Type: Grant
    Filed: September 27, 1989
    Date of Patent: August 25, 1992
    Assignee: Chevron Research Company
    Inventors: Vernon R. Small, Jr., Thomas V. Liston, Anatoli Onopchenko
  • Method of preparing borated alkyl aromatic polyols
    Patent number: 5102569
    Abstract: A method of preparing a borated alkylcatechol by first reacting catechol with boric acid and thereafter alkylating with an olefin.
    Type: Grant
    Filed: October 23, 1990
    Date of Patent: April 7, 1992
    Assignee: Chevron Research and Technology Company
    Inventors: Anatoli Onopchenko, Thomas V. Liston
  • Diethylamine complexes of borated alkyl catechols and lubricating oil compositions containing the same
    Patent number: 5061390
    Abstract: Lubricating oils containing a borated alkyl catechol-diethylamine complex are effective in reducing oxidation, wear and deposits in an internal combustion engine.
    Type: Grant
    Filed: December 4, 1990
    Date of Patent: October 29, 1991
    Assignee: Chevron Research and Technology Company
    Inventors: Vernon R. Small, Jr., Thomas V. Liston, Anatoli Onopchenko
  • Methods for preparing, group II metal overbased sulfurized alkylphenols
    Patent number: 5024773
    Abstract: The present invention is directed toward a method for preparing Group II metal overbased sulfurized alkylphenols. In particular, the present invention employs a sulfurization catalyst in the preparation of Group II metal overbased sulfurized alkylphenols. Use of a sulfurization catalyst in this preparation results in a product generally characterized as having lower crude sediment, a higher Total Base Number and lower viscosity than a similar product prepared without using a sulfurization catalyst.
    Type: Grant
    Filed: May 17, 1989
    Date of Patent: June 18, 1991
    Assignee: Chevron Research Company
    Inventor: Thomas V. Liston
  • Diethylamine complexes of borated alkyl catechols and lubricating oil compositions containing the same
    Patent number: 4975211
    Abstract: Borated alkyl catechols can be stabilized by the addition of diethylamine.Lubricating oils containing a borated alkyl catecholdiethylamine complex are effective in reducing oxidation, wear and deposits in an internal combustion engine.
    Type: Grant
    Filed: July 5, 1989
    Date of Patent: December 4, 1990
    Assignee: Chevron Research Company
    Inventors: Vernon R. Small, Jr., Thomas V. Liston, Anatoli Onopchenko
  • Methods for preparing, Group II metal overbased sulfurized alkylphenols
    Patent number: 4971710
    Abstract: The present invention is directed toward a method for preparing Group II metal overbased sulfurized alkylphenols. In particular, the present invention employs a sulfurization catalyst in the preparation of Group II metal overbased sulfurized alkylphenols. Use of a sulfurization catalyst in this peparation results in a product generally characterized as having lower crude sediment, a high Total Base Number and lower viscosity than a similar product prepared without using a sulfurization catalyst.
    Type: Grant
    Filed: May 16, 1988
    Date of Patent: November 20, 1990
    Assignee: Chevron Research Company
    Inventor: Thomas V. Liston
  • Methods for preparing, group II metal overbased sulfurized alkylphenols
    Patent number: 4744921
    Abstract: The present invention is directed toward a method for preparing Group II metal overbased sulfurized alkylphenols. In particular, the present invention employs a sulfurization catalyst in the preparation of Group II metal overbased sulfurized alkylphenols. Use of a sulfurization catalyst in this preparation results in a product generally characterized as having lower crude sediment, a higher Total Base Number and lower viscosity than a similar product prepared without using a sulfurization catalyst.
    Type: Grant
    Filed: October 21, 1986
    Date of Patent: May 17, 1988
    Assignee: Chevron Research Company
    Inventor: Thomas V. Liston
  • Metal salts of alkyl catechol dithiophosphoric acids and oil compositions containing the salts
    Patent number: 4729848
    Abstract: Metal salts of alkyl catechol esters of dithiophosphoric acid suitable as additives in oil compositions are disclosed. Oil compositions containing the salts of such esters show improved extreme pressure/anti-wear and anti-oxidant properties.
    Type: Grant
    Filed: September 8, 1986
    Date of Patent: March 8, 1988
    Assignee: Chevron Research Company
    Inventors: Elaine S. Yamaguchi, Thomas V. Liston
  • Lubricating oil compositions containing overbased calcium sulfonates and metal salts of alkyl catechol dithiophosphoric acid
    Patent number: 4668409
    Abstract: The anti-wear properties of lubricating oil compositions containing overbased calcium sulfonate are improved when a metal salt of an alkyl catechol ester of dithiophosphoric acid is added to the oil. Oil compositions containing this combination are useful as crankcase lubricants.
    Type: Grant
    Filed: September 30, 1983
    Date of Patent: May 26, 1987
    Assignee: Chevron Research Company
    Inventors: Elaine S. Yamaguchi, Thomas V. Liston
  • Normally liquid C.sub.18 to C.sub.24 monoalkyl catechols
    Patent number: 4643838
    Abstract: This invention relates to normally liquid lubricating oil additives which provide both antioxidant and friction-modifying properties when added to lubricating oil. In particular, this invention relates to C.sub.18 to C.sub.24 alkyl catechol lubricating oil additives which are normally liquid at typical storage temperatures.
    Type: Grant
    Filed: September 18, 1985
    Date of Patent: February 17, 1987
    Assignee: Chevron Research Company
    Inventors: Thomas V. Liston, Warren Lowe, Vernon R. Small
  • Normally liquid C.sub.14 to C.sub.18 monoalkyl catechols
    Patent number: 4632771
    Abstract: This invention relates to normally liquid lubricating oil additives which provide both anti-oxidant and friction-modifying properties when added to lubricating oil. In particular, this invention relates to C.sub.14 to C.sub.18 alkyl catechol lubricating oil additives which are normally liquid at typical storage temperatures.
    Type: Grant
    Filed: March 14, 1985
    Date of Patent: December 30, 1986
    Assignee: Chevron Research Company
    Inventors: Thomas V. Liston, Warren Lowe, Vernon R. Small
  • Method for improving fuel economy of internal combustion engines
    Patent number: 4629577
    Abstract: Lubricating oils containing borated alkyl catechols and a succinimide have been found to reduce fuel consumption in an internal combustion engine.
    Type: Grant
    Filed: June 17, 1985
    Date of Patent: December 16, 1986
    Assignee: Chevron Research Company
    Inventor: Thomas V. Liston
  • Succinimide complexes of borated alkyl catechols and lubricating oil compositions containing same
    Patent number: 4629578
    Abstract: Lubricating oils containing borated alkyl catechols-succinimide complex are effective in reducing fuel consumption in an internal combustion engine.
    Type: Grant
    Filed: June 17, 1985
    Date of Patent: December 16, 1986
    Assignee: Chevron Research Company
    Inventor: Thomas V. Liston
  • Method for improving fuel economy of internal combustion engines
    Patent number: 4495088
    Abstract: Lubricating oils containing borated fatty acid esters of glycerol and a succinimide have been found to reduce fuel consumption in an internal combustion engine.
    Type: Grant
    Filed: February 24, 1983
    Date of Patent: January 22, 1985
    Assignee: Chevron Research Company
    Inventor: Thomas V. Liston
  • Lubricating oil compositions containing an overbased calcium sulfonate and a zinc cyclic hydrocarbyl dithiophosphate-succinimide complex
    Patent number: 4487704
    Abstract: The anti-wear properties of lubricating oil compositions containing overbased calcium sulfonate are improved when a complex of a zinc salt of a cyclic hydrocarbyl dithiophosphoric acid of 2,4-pentanediol and a succinimide is added to the oil. Oil compositions containing this combination are useful as crankcase lubricants.
    Type: Grant
    Filed: November 22, 1982
    Date of Patent: December 11, 1984
    Assignee: Chevron Research Company
    Inventors: Elaine S. Yamaguchi, Thomas V. Liston